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Cresent Nebula (NGC6888)

alan4908

By alan4908

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A bi-colour image of the Cresent nebula with Ha mapped to Red and OIII mapped to Blue and Green.  The OIII is very strong with this object to the point where it can overwhelm the Ha, reducing the redness, so I had to experiment with the relative contributions.

I was quite impressed by the amount of detail revealed by the Esprit 150, in particular, I like the "bubble wrap" appearance made by the OIII contribution. About 8.5 hours total integration time.

LIGHTS: 6 Ha, 11 OIII x 1800s, BIAS: 100, DARKS: 30, LIGHTS:40 all at -20C.

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Deep Sky III

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alan4908
23 minutes ago, ollypenrice said:

Very good indeed! A bit of RGB for the stellar cores, maybe? You'd need so little.

Olly

Thanks Olly.  

Originally, I was going to replace the NB stars with RGB ones - however, I quite liked the way the starfield turned out, so I decided to leave it as a "pure" NB image.

Alan

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